There might be a US fleet, but if there is it is hundreds of miles to the south. Which still might be close enough for a TLAM.
I don't think it's just this mission. The first DW mission I ever created, Taiwan ARG Escort, I must have run dozens of times as a test mission... and the success of the TLAMs fired at the coastal missile batteries is only about 50%...some of them just fail to explode.
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